I just updated my site. It has more info on the unattend and oem. You can install in any order in the GUIRunonce (sp?) section of the unattend. Use the oem folder to copy the installers to the harddrive.
Second option, use sysdiff. Take a snapshot of all programs in order and then apply the inf file at the end.
I will be posting more info my site in the next week. I will try to focus on this information first.

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You can also search
www.ntfaq.com for installation order. I seem to remember the same information showing up there.
Thanks,